The manga is, so far, very faithful, as far as I can tell from my limited understanding and what the translators in #moob have told me. It's also quite nicely styled. It doesn't focus much on action, but neither do the novels. Instead of action, we get merchant-speak. Talking about trading grapes for this and salt for that and going here and selling this, etc., etc.. Not sure how long that'll hold up, seems like there's a "Church" that doesn't like pagan deities such as Horo very much. Reminds me of Scrapped Princess a little. Just a bit.
